<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片内容区域 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert
        title="注意：只允许第三级分类设置相关参数!"
        type="warning"
        show-icon
        :closable="false"
      >
      </el-alert>

      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类:</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            v-model="selectedCateKeys"
            :options="catelist"
            :props="cateProps"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>

      <!-- tabs标签页 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 动态模块 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button
            type="primary"
            @click="addDialogVisible = true"
            :disabled="isBtnDisabled"
            >动态参数</el-button
          >
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" style="width: 100%" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag
                  :key="i"
                  v-for="(item, i) in scope.row.attr_vals"
                  closable
                >
                  {{ item }}
                </el-tag>
                <!-- 切换文本按钮 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <el-table-column type="index" label="序号"> </el-table-column>
            <el-table-column prop="attr_name" label="参数名称">
            </el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  size="mini"
                  type="primary"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  size="mini"
                  type="danger"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 静态模块 -->
        <el-tab-pane label="静态属性" name="only">
          <el-button
            type="primary"
            @click="addDialogVisible = true"
            :disabled="isBtnDisabled"
            >静态属性</el-button
          >
          <!-- 静态参数表格 -->
          <el-table :data="onlyTableData" style="width: 100%" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 遍历tag -->
                <el-tag
                  :key="i"
                  v-for="(item, i) in scope.row.attr_vals"
                  closable
                  @close="handleClose(i, scope.row)"
                >
                  {{ item }}
                </el-tag>
                <!-- 切换文本按钮 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <el-table-column type="index" label="序号"> </el-table-column>
            <el-table-column prop="attr_name" label="静态参数">
            </el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  size="mini"
                  type="primary"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  size="mini"
                  type="danger"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>

      <!-- 添加参数对话框 -->
      <el-dialog
        :title="'添加' + titleText"
        :visible.sync="addDialogVisible"
        width="50%"
        @close="addDialogClosed"
      >
        <!-- 添加参数的表单 -->
        <el-form
          :model="addForm"
          :rules="addFormRules"
          ref="addFormRef"
          label-width="100px"
        >
          <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="addForm.attr_name"></el-input>
          </el-form-item>
        </el-form>

        <span slot="footer" class="dialog-footer">
          <el-button @click="addDialogVisible = false">取 消</el-button>
          <el-button type="primary" @click="addParams">确 定</el-button>
        </span>
      </el-dialog>

      <!-- 修改参数对话框 -->
      <el-dialog
        :title="'修改' + titleText"
        :visible.sync="editDialogVisible"
        width="50%"
        @close="editDialogClosed"
      >
        <!-- 修改参数的表单 -->
        <el-form
          :model="editForm"
          :rules="editFormRules"
          ref="editFormRef"
          label-width="100px"
        >
          <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="editForm.attr_name"></el-input>
          </el-form-item>
        </el-form>

        <span slot="footer" class="dialog-footer">
          <el-button @click="editDialogVisible = false">取 消</el-button>
          <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
      </el-dialog>
    </el-card>
  </div>
</template>

<script>

export default ({
  data() {
    return {
      // 商品分类数据列表
      catelist: [],
      // 级联选择框的配置对象
      cateProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 级联选择框双向绑定到的数组
      selectedCateKeys: [],
      // tabs标签页双向绑定数据
      activeName: 'many',
      // 动态表格参数
      manyTableData: [],
      // 静态表格
      onlyTableData: [],
      // 添加参数对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据
      addForm: {
        attr_name: ''
      },
      // 添加表单验证规则的对象
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入正确参数', trigger: 'blur' }
        ]
      },
      // 修改对话框的显示或隐藏
      editDialogVisible: false,
      // 修改的表单数据对象
      editForm: {
        attr_name: ''
      },
      // 修改表单验证规则
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入正确参数', trigger: 'blur' }
        ]
      }
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取所有的商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$notify.error('获取商品列表失败!')
      }
      this.catelist = res.data
      console.log(this.catelist);
    },
    // 级联选择框选中项变化，触发事件
    handleChange() {
      this.getParamsData()
    },
    // 获取参数的列表数据
    async getParamsData() {
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }

      console.log(this.selectedCateKeys);

      // 获取分类参数列表
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
        params: { sel: this.activeName }
      })
      if (res.meta.status !== 200) {
        return this.$notify.error('数据获取失败!')
      }


      // 将数据分组
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本显示或隐藏
        item.inputVisible = false
        item.inputValue = ''
      })

      console.log(res.data);

      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // tab点击触发事件
    handleTabClick() {
      this.getParamsData()
    },
    // 监听属性变化 重置表单
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    //  点击按钮,添加参数
    addParams() {
      // 首先预效验参数
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })

        if (res.meta.status !== 201) {
          return this.$notify.error('添加参数失败')
        }
        this.$notify.success('添加参数成功')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    // 修改参数对话框
    async showEditDialog(arrt_id) {
      // 查询当前参数的信息
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${arrt_id}`, {
        params: { attr_sel: this.activeName }
      })
      if (res.meta.status !== 200) {
        return this.$notify.error('请求数据失败')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 监控修改对话框关闭 重置表单
    editDialogClosed() {

      this.$refs.editFormRef.resetFields()
    },
    // 修改数据确定之后更新表单
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 200) {
          return this.$notify.error('数据修改失败')
        }
        this.$notify.success('数据修改成功')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    // 删除参数操作
    async removeParams(attr_id) {
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)

      // 用户取消了删除的操作
      console.log(confirmResult);
      if (confirmResult !== 'confirm') {
        return this.$notify.info('已取消删除')
      }

      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
      if (res.meta.status !== 200) {
        return this.$notify.error('删除参数失败')
      }
      this.$notify.success('删除参数成功')
      this.getParamsData()

    },
    // 按钮enter或 blur都会触发事件
    async handleInputConfirm(row) {
      // trim 清除两端的空格
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 没有return就会进行后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false

      this.saveAttrVals(row)

    },
    // 删除对应的参数可选项
    handleClose(i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    },
    // 将对attr_vals 的操作保存到数据库
    async saveAttrVals(row) {
      // 编辑提交的参数
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })
      if (res.meta.status !== 200) {
        return this.$notify.error('数据传输失败')
      }
    },
    // 点击按钮触发文本
    showInput(row) {
      row.inputVisible = true
      // nextTick作用 当页面元素被重新渲染之后，才会指定回调函数中的代码，直接使用下面一段代码会报错
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    }
  },
  computed: {
    // 如果按钮需要被禁用，则返回true,否则返回false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true
      } else {
        return false
      }
    },
    // 计算参数列表需要获取的ID值,当前选中的三级分类
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 动态静态属性标题
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
})
</script>

<style lang="less" scoped>
.cat_opt {
  padding: 10px 0;
}
.el-tag {
  margin: 10px;
}
.input-new-tag {
  width: 120px;
}
</style>